I am trying to setup a development machine using 20.04 and am having problems with the Monodevelop environment.

Whenever I create a solution and project it seems that it cannot find the proper build setup. I suspect there is some problem when using the 18.04 mono repositories on 20.04, but I can't find out how to fix it.

This is the error I receive when I try to build using the Monodevelop IDE:

/usr/lib/mono/msbuild/15.0/bin/Microsoft.CSharp.CurrentVersion.targets(5,5): 
Error MSB4019: The imported project "/usr/lib/mono/msbuild/15.0/bin/Roslyn/Microsoft.CSharp.Core.targets" was not found.
Confirm that the path in the <Import> declaration is correct, and that the file exists on disk. (MSB4019) (HelloWorld)

Does anyone know how to get a working version of Monodevelop on Ubuntu 20.04?

ubuntu19.04 disco, monodevelop 7.8.4(build 2)

Using monodevelop, I created a new solution(form based gtk# gui application). I added a Windows.Forms.Webbrowser control to my Form1.

When I start debugging, the application quit without showing a form at all. Instead of it, monodevelop left these messages below : libgluezilla not found. To have webbrowser support, you need libgluezilla installed

But libmono-webbrowser4.0-cil is already installed in the os ( as below ).

$ sudo apt-cache search libgluezilla
 libmono-webbrowser4.0-cil - Mono Web Browser library (for CLI 4.0)

$ sudo apt-get install libmono-webbrowser4.0-cil
libmono-webbrowser4.0-cil is already latest version (6.0.0.313-0xamarin3+ubuntu1804b1) 
upgraded: 0 , installed: 0, removed: 0, pending: 39.

$ dpkg --contents libmono-webbrowser4.0-cil_6.0.0.313-0xamarin3+ubuntu1804b1_all.deb
 drwxr-xr-x root/root         0 2019-07-14 18:12 ./
 drwxr-xr-x root/root         0 2019-07-14 18:12 ./usr/
 drwxr-xr-x root/root         0 2019-07-14 18:12 ./usr/lib/
 drwxr-xr-x root/root         0 2019-07-14 18:12 ./usr/lib/mono/
 drwxr-xr-x root/root         0 2019-07-14 18:12 ./usr/lib/mono/4.5/
 drwxr-xr-x root/root         0 2019-07-14 18:12 ./usr/lib/mono/gac/
 drwxr-xr-x root/root         0 2019-07-14 18:12 ./usr/lib/mono/gac/Mono.WebBrowser/
 drwxr-xr-x root/root         0 2019-07-14 18:12 ./usr/lib/mono/gac/Mono.WebBrowser/4.0.0.0__0738eb9f132ed756/
 -rw-r--r-- root/root    166912 2019-07-14 18:12 ./usr/lib/mono/gac/Mono.WebBrowser/4.0.0.0__0738eb9f132ed756/Mono.WebBrowser.dll
 -rw-r--r-- root/root        87 2019-07-14 18:12 ./usr/lib/mono/gac/Mono.WebBrowser/4.0.0.0__0738eb9f132ed756/Mono.WebBrowser.dll.config
 drwxr-xr-x root/root         0 2019-07-14 18:12 ./usr/share/
 drwxr-xr-x root/root         0 2019-07-14 18:12 ./usr/share/doc/
 drwxr-xr-x root/root         0 2019-07-14 18:12 ./usr/share/doc/libmono-webbrowser4.0-cil/
 -rw-r--r-- root/root     14745 2019-07-14 18:12 ./usr/share/doc/libmono-webbrowser4.0-cil/changelog.Debian.gz
 -rw-r--r-- root/root     33084 2019-07-14 17:56 ./usr/share/doc/libmono-webbrowser4.0-cil/copyright
 lrwxrwxrwx root/root         0 2019-07-14 18:12 ./usr/lib/mono/4.5/Mono.WebBrowser.dll -> ../gac/Mono.WebBrowser/4.0.0.0__0738eb9f132ed756/Mono.WebBrowser.dll

In the .pkg, there is a Mono.WebBrowser.dll but there seems to be no libgluezilla* at all. Is the ubuntu pkg correct?

What is the problem and how to fix it? Why monodevelop complains and doesn't run the applications using Windows.Forms.Webbrowser control at all?

I'm trying to install the NuGet package management addin for MonoDevelop but I'm lost on how to do it. Can someone help me get it installed?

How am I able to use mono develop to make like a vb.net program not using the code but to where it has a window and you can add buttons and all of that.

I want to test each and every project type available on mono. But due to some package dependencies Im unable to run any of "Hello World" project. I have less idea what libraries I need for what.

Few days back I have installed gtk-sharp2 but still while running an VB.net Gtk# or C# Gtk# Im getting compilation errors that cli.Gtk does not exist.

Is there a way through which I can solve all dependencies by one click ?! I atleast once want to try learning linux app programming. Without the proper tools it is not possible. Please help :)

Mono Develop Version : 2.8.6.3 Ubuntu 12.04 32 Bit